The Gunners' 11th victory in a row was marred by bitter drama at the end as Lichtsteiner appeared to say something to Uruguay defender Coates, who then approached the Arsenal full-back and sent him flying.
TV cameras caught what looked a blatant assault from Coates, whose blunder had handed Danny Welbeck a deserved 77th minute winner in this Europa League clash.
And Gunners supporters were baffled at how officials seemingly failed to spot Coates thrusting his head into Lichtsteiner's – in the middle of the penalty area.
One fan tweeted: "Wonder what match @EuropaLeague officials are watching where they completely miss Coates headbutt on @LichtsteinerSte."
Another said: "Tough game for Arsenal, but we did it. 5 referees, but still couldn't spot a headbutt from Coates on Lichtsteiner. Job done lads."
Supporters also called for TV evidence to land Coates in hot water.
One argued: "Surely a retrospective ban for Coates. Definite headbutt on to banned after TV footage is studied. Definite headbutt on Lichtsteiner."
Similar views included: "Uefa has to suspend Coates for that headbutt on Lichtsteiner."
The main feeling, though, was amazement – at all five officials apparently missing the incident.
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